add frontend typecheck to gh actions

Author: ffreddow

.github/workflows/frontend-tests.yml

@@ -38,6 +38,10 @@ jobs:
       working-directory: ./frontend
       run: npm run lint
 
+    - name: Run typecheck
+      working-directory: ./frontend
+      run: npm run typecheck
+
     - name: Run unit tests
       working-directory: ./frontend
       run: npm run test:unit:run